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susabi edited this page Feb 12, 2019
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Welcome to the disk.frame wiki!
Many of disk.frame
's functions, such as map.disk.frame
and delayed
are just convenience functions to let you perform the same operation to each chunk. The convenience comes from the fact that it loads every chunk into a data.table/data.frame and does the saving to disk automatically into .fst files.
disk.frame_code({
libname(a, path1)
libname(b, path2)
a~disk.frame2 = delayed(b~disk.frame1, some_fn)
})